I really like how mystical it feels in the beginning, and then the drum break becomes really exhilarating and that cool heavy synth comes in. Nice job!

WAIT A SEC THIS ISN'T JAZZ AT ALL. >:U

Hehe, might not be Jazz, but it definitely is awesome.

The intro was pretty sick, and I mean psy-sick. The short synth trills were a really cool addition, and made the mood of the song a sort of powerful/disturbing kind of thing. One thing furthering this combination was the use of the jazzy, clean and bright piano along the more effect-heavy d'n'b synths, which gave the song an interesting dimension that I think many songs lack, as a lot of people tend to stick to one "type" of instrument style within a song, with very little or no thinking out of the box.

I absolutely loved all the sounds you used in this one, the diving bass from 1:25 being my definite favorite. The piano I mentioned before was also really nice, sounded almost mellow, in fact (apart from the faster part at 0:52 and beyond :P).

The percussion is pretty cool, and I really appreciated the fact that you left it more minimalistic at times, just so the occasional unexpected cymbal or hat would stand out more (taking that this was, in fact, your intention).

To round it up: this WIP is very close to being a full fledged song, in my humble opinion. I'd say that by now finishing this song is more about adding a few more touches that you believe are necessary, but from my point of view, it's as good as finished. Nice work.